11/16th is close to 0.690", 0.6875" versus 0.690" . I tried to look up a couple of speciality tap manufacturers and they only list a 11/16 - 40 tpi. This one is marked NS as in Nation Special, time to dig out the old machinist handbooks. Nothing like a odd tap mystery.
?I just did a little more web searching and found out SCSSNER is actually SOSSNER, my bad. Sossner is now
SOG Tool.?
?
?They make custom and high end taps including .0005" OS taps. So it is starting to look like Tap #1 was a very special custom tap. I get back from working on a bike tonight, I am going to start digging into what else is in there.?
Jeff
